P0873
DTC P0873: Open in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck OFFNOTE:
^ Record all freeze data and review the General Troubleshooting Information before you troubleshoot.
^ This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
1. Clear the DTC with the HDS.
2. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
3. Drive the vehicle in 4th gear in the D position, and verify that the SHIFT MAP NUMBER indicates 4th with the HDS in the A/T data list.
4. Check the 4th PRES SWITCH signal with the HDS in the A/T data list.
Is the 4th PRES SWITCH ON?
YES--Go to step 5.
NO--Go to step 7.
5. Drive the vehicle in 4th gear in the D position for more than 5 seconds, then slow down and stop the wheels.
6. Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0873.
Did the result indicate a fail?
YES--Go to step 7.
NO-- Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to step 5 and recheck.
7. Turn the ignition switch OFF.
8. Disconnect the 4th clutch transmission fluid pressure switch connector.
9. Turn the ignition switch ON (II).
10. Measure the voltage between the 4th clutch transmission fluid pressure switch connector terminal and body ground.
Wire side of female terminals
Is there about 10 V?
YES-Replace the 4th clutch transmission fluid pressure switch. Then go to step 15.
NO-Go to step 11.
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (44P).
14. Check for continuity between PCM connector terminal C16 and 4th clutch transmission fluid pressure switch connector terminal.
Is there continuity?
YES-Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck, If the symptom/indication goes away with a known-good PCM, replace the original PCM.
NO-Repair open in the wire between PCM connector terminal C16 and the 4th clutch transmission fluid pressure switch, then go to step 15.
15. Clear the DTC with the HDS.
16. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
17. Drive the vehicle in 4th gear in the D position for more than 5 seconds, then slow down and stop the wheels.
18. Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0873.
Did the result indicate a pass?
YES-The problem has been corrected.
NO-Return to step 1 and recheck.